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Abstract

The Air Pressure Compensation aspect of a Drive Away Release (DAR) software strategy aims to modify the release behaviour of the system to take into account the difference in engine performance resulting from variation in ambient air pressure.
The environmental parameter actually affecting engine performance is ambient air density, however, this data is not available to the EPB system without the addition of extra sensing apparatus. Instead, the ambient air pressure value is considered by this strategy as this data is available on the vehicle network in the form of an existing data message. For the purposes of this simple compensation strategy the two parameters can be considered the same in terms of effect on engine performance.

Country

United Kingdom

Language

English (United Kingdom)

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This is the abbreviated version, containing approximately
55% of the total text.

The
Air Pressure Compensation aspect of a Drive Away Release (DAR) software
strategy aims to modify the release behaviour of the system to take into
account the difference in engine performance resulting from variation in
ambient air pressure.

The
environmental parameter actually affecting engine performance is ambient air density, however, this data is not
available to the EPB system without the addition of extra sensing
apparatus. Instead, the ambient air pressure value is considered by this
strategy as this data is available on the vehicle network in the form of an
existing data message. For the purposes
of this simple compensation strategy the two parameters can be considered the
same in terms of effect on engine performance.

Throughout
this document the term pedal % refers
to the accelerator pedal position, where 0% is released and 100% is fully
depressed.

The
ambient air pressure can be said to reduce with increasing air temperature and
/ or increasing altitude. This can be
summarised as follows:-

> air temperature = < air pressure

> altitude above sea level = < air pressure

The
effect of air pressure changes on engine output can be generalised as:-

< air pressure = < engine torque output

Therefore:-

> air temperature = < engine torque output

> altitude above sea level = < engine torque output

It
follows that the "hot and high" condition can be considered a worst
case in terms of available engine torque to move the vehicle away from
stationary.

From
investigation of atmospheric characteristics it is appropriate to generalise
that the effect of air temperature increase on air pressure is markedly less
than the effect of increase in altitude.

The
Air Pressure compensation algorithm fits into the overall DAR strategy between
the Pedal % determination stage and the Pedal % wait stage. The algorithm takes the calculated pedal %
value from the initial stage of the DAR strategy and modifies this value to
result in an increased pedal % requirement.
The DAR strategy then continues to the Pedal % wait stage where the
pedal % value is monitored until the required % is seen.